Executive brief
A vulnerability in the Windows Kernel could allow a user who is already logged into a system to gain full administrative control. The Windows Kernel is the core part of the operating system that manages hardware and system resources. If exploited, an attacker could bypass security restrictions to access sensitive data, install malicious software, or disrupt business operations.
Technical details
An integer overflow or wraparound vulnerability (CWE-190) exists within the Windows Kernel. The flaw is triggered when the kernel improperly handles specific arithmetic operations, leading to memory corruption or logic errors. An attacker with local access and low-level privileges can exploit this to execute code in kernel mode, effectively gaining full SYSTEM privileges. The attack requires no user interaction but does require the attacker to have an existing authorized account on the target machine. Microsoft has released security updates to address this issue across various versions of Windows 10, Windows 11, and Windows Server 2012.
Affected products
- Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 Versions 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 All editions including Server Core
Timeline
- 2026-07-14: disclosed: Initial publication by Microsoft and NVD
- 2026-07-14: advisory: Microsoft Security Update Guide published for CVE-2026-58532